Nitrogen (Nitrogenium; N; Greek a - negative part + zoe - life) is a chemical element of group V of the periodic system of D. I. Mendeleev with an atomic mass (weight) of 14.007; atomic number - 7. In living organisms, nitrogen is part of proteins and their derivatives. In molecular form (N 2), it is a gas that makes up 78% of the volume of the earth's atmosphere.
Allocate:
Protein nitrogen - nitrogen, which is part of proteins. The term is used for the quantitative determination of protein in biological substrates;
Aminine nitrogen (synonym: amino nitrogen) - nitrogen, which is part of the amino acids contained in the test substrate. An increase in the content of amine nitrogen in human urine and blood is a sign of a violation of the urea-forming function of the liver;
Residual nitrogen (synonym: protein-free nitrogen, non-protein nitrogen) - nitrogen, which is a part of non-protein nitrogenous substances of blood, muscles and other tissues. A change in the content of residual nitrogen in the blood serum indicates a violation of nitrogen metabolism in the body.
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Automatism (Greek automates spontaneous, self-acting) - the ability of individual cells, tissues or organs to rhythmic activity in the absence of obvious connections with external stimuli
Adaptation (lat.adaptatio - adaptation) - the process of adaptation of an organism, population or other biological system to changing conditions of existence (functioning)
Adenoma (adenoma; Greek aden - iron + Greek ōma - ending in the name of tumors) is a benign tumor arising from the glandular epithelium and retaining structural similarity with the original tissue
Adrenergic receptors (lat.adrenalis - adrenal; lat.ad- - at + ren - kidney + receptor - receiving; synonym: adrenergic receptors, adrenoreactive structures, adrenoreactive systems) - biochemical structures of cells that interact with adrenergic mediators (dopamine, adrenaline, noradrenaline ) and convert the energy of this interaction into the energy of a specific effect (muscle contraction, nerve impulse)
Acrodermatitis (acrodermatitis; Greek akros - the most distant, extreme, high + derma (dermatos) - skin + Latin it (word-form suffix) - inflammatory process) - the general name of a group of dermatoses with an exclusive or predominant lesion of the distal extremities
